Air diffuser



FIG. 1 is a perspective view of an air diffuser showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is left-hand view thereof;

FIG. 6 is a right-hand view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is another right-hand view thereof; and,

FIG. 10 is a cross-sectional view thereof as viewed along line 10-10 shown in FIG. 9. 

CLAIM The ornamental design for an air diffuser, as shown and described. 